from microbit import * 
# indentations in text are importantfrom microbit import * 

# need to remember to add random import 
import random

display.clear()

# chemistry - first 20 elements
# randomly selects an element
# shows the symbol, name, atomic number (AN) & atomic weight (AW)

lookup = {
"H": ["H", "Hydrogen", 1, 1],
"He": ["He", "Helium", 2, 4],
"Li": ["Li", "Lithium",3,7],
"Be": ["Be", "Beryllium",4,9],
"B": ["B", "Boron",5,11],
"C": ["C", "Carbon",6,12],
"N": ["N", "Nitrogen",7,14],
"O": ["O", "Oxygen",8,16],
"F": ["F", "Fluorine",9,19],
"Ne": ["Ne", "Neon",10,20],
"Na": ["Na", "Sodium",11,23],
"Mg": ["Mg", "Magnesium",12,24],
"Al": ["Al", "Aluminium",13,27],
"Si": ["Si", "Silicon",14,28],
"P": ["P", "Phosphorus",15,31],
"S": ["S", "Sulphur",16,32],
"Cl": ["Cl", "Chlorine",17,35],
"Ar": ["Ar", "Argon",18,40],
"K": ["K", "Potassium",19,39],
"Ca": ["Ca", "Calcium",20,40],
}

# 1000 = 1 sec
delay_1 = 300
delay_2 = 2000

while True: 
    display.clear()
    
# chose an element at random
    x = random.choice(list(lookup))

# then chose all the information associated with it
    info = lookup.get(x)

# display symbol
    display.scroll(info[0], delay=150)
    sleep(delay_1)

# display name (speed up scroll a bit)
    display.scroll(info[1], delay=120)
    sleep(delay_1)
    
 # display atomic number 
 # (Note: change number into string using 'str')
    display.scroll("AN=" + str (info[2]), delay=150)
    sleep(delay_1)

# display atomic weight / mass
    display.scroll("AM=" + str (info[3]), delay=150)

# longer delay before next random element chosen
    sleep(delay_2)